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d) Độ phóng xạ của lượng $^{90}_{38} Sr$

d) Độ phóng xạ của lượng 3890Sr^{90}_{38} Sr3890​Sr có khối lượng m = 0,0145 μg có giá trị xấp xỉ H = 74,0 kBq.

Thông tin câu hỏi

d) Độ phóng xạ của lượng $^{90}_{38} Sr$ có khối lượng m = 0,0145 μg có giá trị xấp xỉ H = 74,0 kBq.